On Sun, Mar 12, 2017 at 8:20 PM, SIMRAN SINGHAL
[off-list ref] wrote:

On Sun, Mar 12, 2017 at 10:15 PM, Alexander Kapshuk
[off-list ref] wrote:

quoted

On Sun, Mar 12, 2017 at 5:34 PM,  [off-list ref] wrote:

quoted

On Sun, 12 Mar 2017 15:49:31 +0200, Alexander Kapshuk said:

quoted

Are these drivers, drivers/iio/dummy/{iio_dummy_evgen,iio_dummy}.ko,
something of your own making, as I'm not seeing them in the kernel
source tree?

The 'modules_install' make target installs drivers that have been
compiled as modules as opposed to those compiled into the kernel, into
/lib/modules/`uname -r`. For your own modules added to the kernel
source tree, or built out-of-tree, that would involve putting
appropriate entries into  Kconfig and/or Makefiles.

Modeprobe expects your module to be found in /lib/modules/`uname -r`.
Otherwise, your module won't get loaded.

One other thing to remember is that although 'make modules_install' will
take all the .ko files from in-tree modules and put them in their proper
place in /lib/modules/`uname-r`  and then run 'depmod', many out-of-tree
Makefiles manage to forget to do that last step.

modprobe is a wrapper around insmod - and the file produced by 'depmod'
are what the wrapper uses to find the module.

Thanks for elaborating on that.

Still not working

First I executed following commands:-

$ make drivers/iio/dummy/iio_dummy_evgen.ko
$ make drivers/iio/dummy/iio_dummy.ko

Above commands executed successfully

Then I run following command:
$ insmod iio_dummy_evgen.ko

Getting following error:
insmod: ERROR: could not load module iio_dummy_evgen.ko: No such file
or directory

And, then I try executing them from driver/staging/dummy and then I
got this error:
insmod: ERROR: could not insert module iio_dummy_evgen.ko: Operation
not permitted

You have to run insmod as user root. Either specify the full path to
your module, or cd into the directory where the module is and run
insmod from there.